provisions (Tables)

12 Months Ended

Dec. 31, 2021

provisions

Schedule of other provisions

					Written put
	Asset				options and
	retirement		Employee-		contingent
(millions)	obligation		related		consideration 1		Other		Total
As at January 1, 2020	$	495	$	64	$	227	$	92	$	878
Additions		—		48		186		200		434
Reversals		(5)		(1)		(114)		(20)		(140)
Uses		(3)		(69)		(112)		(143)		(327)
Interest effects 2		174		—		2		—		176
Effects of foreign exchange, net		—		—		13		—		13
As at December 31, 2020		661		42		202		129		1,034
Additions		23		84		8		70		185
Reversals		(8)		(2)		(2)		(11)		(23)
Uses		(4)		(58)		(9)		(88)		(159)
Interest effects 2		(171)		—		4		—		(167)
As at December 31, 2021	$	501	$	66	$	203	$	100	$	870
Current	$	4	$	55	$	7	$	30	$	96
Non-current		497		11		196		70		774
As at December 31, 2021	$	501	$	66	$	203	$	100	$	870

1 The December 31, 2020, balance of written put options and contingent consideration has been adjusted, as set out in Note 18(c).

2 The difference of $(186) (2020 – $160) between the asset retirement obligation interest effects in this table and the amount included in the amount disclosed in Note 9 is in respect of the change in the discount rates applicable to the provision, with such difference included in the cost of the associated asset(s) by way of being included with (netted against) the additions detailed in Note 17.